Shields 1" Multiflex Heavy Duty Reinforced PVC Black Bilge Hose (sold by the foot). Shields Multiflex Hose has a clear FDA formula PVC with black vinyl helix. It is abrasion resistant, flexible and is resistant to mild chemicals and saltwater. This hose is primarily used for bilge pump discharge, potable water tank fill and drains (sinks, shower, livewell and scupper). Do not attach to thru hull fitting below the water line. Do not use glycol based antifreeze in hose.